visjs-network/lib/network/modules/components/nodes/shapes/Ellipse.js

A dynamic, browser-based network visualization library.

'use strict'

import NodeBase from '../util/NodeBase'

/**
 * Am Ellipse Node/Cluster shape.
 *
 * @extends NodeBase
 */
class Ellipse extends NodeBase {
  /**
   * @param {Object} options
   * @param {Object} body
   * @param {Label} labelModule
   */
  constructor(options, body, labelModule) {
    super(options, body, labelModule)
  }

  /**
   *
   * @param {CanvasRenderingContext2D} ctx
   * @param {boolean} [selected]
   * @param {boolean} [hover]
   */
  resize(ctx, selected = this.selected, hover = this.hover) {
    if (this.needsRefresh(selected, hover)) {
      var dimensions = this.getDimensionsFromLabel(ctx, selected, hover)

      this.height = dimensions.height * 2
      this.width = dimensions.width + dimensions.height
      this.radius = 0.5 * this.width
    }
  }

  /**
   *
   * @param {CanvasRenderingContext2D} ctx
   * @param {number} x width
   * @param {number} y height
   * @param {boolean} selected
   * @param {boolean} hover
   * @param {ArrowOptions} values
   */
  draw(ctx, x, y, selected, hover, values) {
    this.resize(ctx, selected, hover)
    this.left = x - this.width * 0.5
    this.top = y - this.height * 0.5

    this.initContextForDraw(ctx, values)
    ctx.ellipse_vis(this.left, this.top, this.width, this.height)
    this.performFill(ctx, values)

    this.updateBoundingBox(x, y, ctx, selected, hover)
    this.labelModule.draw(ctx, x, y, selected, hover)
  }

  /**
   *
   * @param {CanvasRenderingContext2D} ctx
   * @param {number} angle
   * @returns {number}
   */
  distanceToBorder(ctx, angle) {
    this.resize(ctx)
    var a = this.width * 0.5
    var b = this.height * 0.5
    var w = Math.sin(angle) * a
    var h = Math.cos(angle) * b
    return (a * b) / Math.sqrt(w * w + h * h)
  }
}

export default Ellipse